On Thu, 2009-03-05 at 15:32 +0000, John Pilkington wrote: > Hi: I'm asking here because this is the most fc10-oriented list that I > use and I thought someone might know the answer. I'd be happy to ask > elsewhere but don't know where might be the best place. > > I'm trying to do shrink-to-fit with video files on fc10 after tcrequant > was deprecated. vamps looks as if it will do the job but I think I need > to chop off a few kb from the end of the input file first to avoid a > failure exit. I can do this with dd but that's slow and file truncation > would be better. I can't see a command-line truncate but since I am > hacking the mythburn.py script I thought I had found the answer here, in > truncate([size]) : > > http://www.python.org/doc/2.5.2/lib/bltin-file-objects.html > > I've tried that. The file size shrinks as required but the result is > zero-filled. Here's some stripped-down test code: > > vobsize = os.path.getsize(source) > write("Initial vobsize is %s bytes" % vobsize) > > vobsize -= 2048 > f=open(source,'wb') > f.truncate( vobsize ) > f.close() > > vobsize = os.path.getsize(source) > write("vobsize after truncation is %s bytes" % vobsize) > > Is this a known problem with python, or in its fc10 implementation? > Where would be the best place to ask how to do this job? I've no idea, but I suspect you could probably write a tiny C program to do the truncation is less time than it would take to get an answer. poc
